Grate bar



Ma 9 I J. D. MCDONALD.

GRATE BAR Filed Jan. 5-, 1926 Patented May 24, 1927.

JOHN DANIEL MCDONALD, F WINNIPEG, MANITOBA, CANADA.

GRATE BAR.

Application filed January 5, 1926, Serial N'o. 79,381, and in Canada September 22', 1 925.

The invention relates to inn irovements in grate bars and an object of the invention is to provide a grate bar particularly adapted for use in saw mills or other places where the fuel used is slabs, log wood or sawdust and where such fuel has become wet by fioating in salt water.- I

A further ob'ect of the invention is to provide a grate bar constructed so that corroding, warping and checking of the bar is prevented and effective draft is provided.

With the above more important objects in view the invention consists essentially in the v arrangement and construction of parts hereinafter more particularly described, reference being had to the accompanying drawing, in which:

Fig. 1 is a perspective view of a portion of a grate and showing my improved grate bar.

Fig. 2 is a vertical sectional view at 22 Figure 1.

Fig. 3 is a longitudinal vertical sectional view at 3-3 Figure 2.

In the drawing like characters of reference indicate corresponding parts in the several figures.

In forming a grate I utilize a plurality of similar grate bars which are placed side by side and have their opposite ends supported by similar parallel side bars 1 and 2. The grate bar which is indicated generally by the reference numeral 3 presents the following parts.

Similar, opposing, parallel, equal length, spaced, vertically set, side bars 4 and 5 are provided and these have their ends contracted to provide horizontally disposed pairs of supporting lugs 6 and 7 which, when the grate bar is in place, rest on the bars 1 and 2. The bars 4 and 5 carry a plurality of similar, equi-spaced, transversely extending and vertically disposed, cross bars 8 of an inverted V-shape. Here, it will be observed that the tips or apex 9 of each bar is uppermost and centrally positioned and is slightly rounded and that the ends of the side wings of the cross bars extend beyond the outer faces of the side bars 4 and 5 as indicated at 10 and 11 and that the extremities thereof are inclined to the vertical as indicated at 12.

Adjacent the end cross bars and overlying the lugs, I locate similar spacing heads 13 and 14 which have their inner sides tapered as indicated at 15 and 16 and merging with the adjoining inclined faces of the adjacent cross bar. The tips 9 of the cross bars are aligned and the upper faces of the flat lying heads are contained in the same horizontal plane as the points or tips of the cross bars.

It will be observed that the grate bars lie transversely of the grate and that once the bars 1 and 2 are placed, it is only necessary to insert a selected number of the grate bars between. the side bars, the number depending on the length of the grate required. The heads of adjacent grate. bars butt together andthe grate bars are all supported by the lugs. Ample air space is provided as indicated at 17 between the cross bars and the air spaces are so positioned that there is a practically uniform distribution of the incoming air through the bed of the fuel lying on the grates and vfurther there is a greater area of the fuel exposed. to the upward movement of the air than is usual in grate bar construction.

As previously intimated this grate bar is specially advantageous where log wood or slabs which have been soaked or floating in salt water are to be burned and in this connection, I might state that in seaport mills,

it is quite common practice to draw the slabs or legs out of the salt water and subsequently burn them in the furnaces. The salt water has a very bad effect on the average grate bar and by utilizing the'grate bar of the construction herein shown, this disadvantage is practically overcome. The logs placed on the grate'are supported by the tips 9 of the grates which is what might be termed pointcontact and every opportunity is given for the liquid to drain out and the grate structure is such that there is no possibility of water lodging for any length of time on any of the grate bars as the inclined faces presented would cause the water to rapidly drain away. Further the comparatively large open spaces between. the cross bars allow the water to drip through. In view of the above features, there is very little possibility of these grate bars warping, checking or corroding. c

What I claim as-my invention is In agrate, the combination of a pair of parallel, spaced, upstanding, side bars having their ends terminating in horizontally disposed supporting lugs and their upper faces converging upwardly, a plurality of equi-spaced, vertically set, inverted V- sheped, cross bars carried by the side hers, said cross bars having the upper tips there of centrally located and elevated in respect to the side bars and longitudinally aligned and their uppei converging faces flush with the converging faces of the side bars and. horizontally dlsposed spacing heads eennectbars.

Signed atldinnipeg this 8th day of December, 1925.

JOHN DANIEL MCDONALD. 

